Comparative evaluation of three-generation HT bus from 1.0 to 3.0 AMD

AMD HyperTransport (HT) technology believes that players are familiar with the user, we know that the traditional processor and memory exchange data, is the processor-North Bridge-memory Exchange form, and this form of disadvantage is that the delay in the exchange of data is relatively large, and AMD HT technology is the solution to this problem, the original integration in the North Bridge memory controller integrated into the CPU, so that the memory and processor exchange data between the delay greatly shortened, which is K8 can have a brilliant era of the leading technology.





&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; And now, the release of AMD K10, HT technology from the original 1.0 development to now 3.0, from the original 800MHz working frequency up to now 2.6Ghz, then, the development of HT, in the end, how much improve the performance? This article does a simple test to answer this question.

Test method

We will CPU the main clock, memory frequency and parameters and graphics frequency, etc. to maintain consistent, only the targeted reduction of HT frequency manually set to 200mhz/1000mhz/2000hz, compared to its HT frequency change in the end to improve the performance of how much, in what frequency to meet the system bandwidth.

HyperTransport 3.0 and HyperTransport 2.0, HyperTransport 1.X Specifications Comparison

In addition to being faster on specs, the above figure can see that HT 3.0 has some features that were not available from previous versions of HT, including AC keyboard-based, link splitting (connected split, also called un-ganging), hot Plugging (hot docking) and dynamic Link clock/width adjustment (dynamically linked clock/bit width adjustment).

Link splitting can split a bit link into two 8-bit links, which can increase the number of links to achieve more CPU multilink without requiring additional equipment, which is used in the server area. The hot plug allows HT devices to be removed directly from the working system, this is used for those storage servers, while dynamic link clock/bit width adjustment allows the dynamic adjustment of the HT3 link frequency and the number of bits transmitted per week, for example, if the CPU detects that the HT bus frequency does not need to be so high, it can be from 2, Is tuned to 1,000 MHz, which is also true for the number of bits transferred, which can be reduced from 16 to low enough, which is very helpful for desktop phenom.